Delaware Driver Education State Practice Test

When is the roadway the slipperiest during rainfall?

1. The beginning

2. The middle

3. The end

4. After a storm

The correct answer is: The beginning

The roadway is the slipperiest during the beginning of rainfall due to a combination of factors. Initially, when rain begins to fall, it mixes with the oils and grime that have accumulated on the road surface. This slick combination creates a very slippery layer, as the oil does not immediately mix with the water, leading to reduced traction for vehicles. As rainfall continues, the water typically washes away much of this oil, leading to improved traction as the road becomes saturated. Therefore, the first moments of rain present the greatest hazard, as drivers are often not yet aware of the slick conditions that can lead to a loss of control. This phenomenon highlights the importance of exercising caution and reducing speed during the initial stages of a rainstorm.